counterclockwise until a hum be-
gins. K e e p turning the contact
12 to 14 volts and listen with the
screw assembly until hum stops.
Reverse direction of contact screw
(f) A crackle in the headset or an
assembly until hum just begins and
erratic vibration indicates loose ad-
then stop turning the contact screw
justments of the carbon pile. No
assembly at this point.
noise at all indicates too tight an
Note. The contact screw assembly is
adjustment of the carbon pile.
locked by a locking screw (fig. 58) on each
(g) Remove the carbon pile support
side of it. Loosen these screws before
attempting to adjust the contact screw
assembly. T i g h t e n these two locking
loose carbon pile by turning the
screws after adjustments are made to the
clockwise just enough to eliminate
(h) After the carbon pile of the voltage
t h e crackle and leave a distinct
regulator element assembly is ad-
hum. Loosen a tight carbon pile by
justed for setting, allow to vibrate
for 30 minutes, and check occasion-
turning the contact screw assembly
Figure 55. Setting the carbon pile of the Leece-Neville Company generator (alternator) regulator.